You're over-thinking my friend.
Don't go into ANY draft with a feeling that you must draft a certain player and/or position in a certain round. No matter what, you should be looking to get the best value for your picks.
Odds are, the draft isn't going to go how you think it is based off your ADP. No draft in history has went according to plan based off of ADP.
Here's an excerpt from an article dealing with the exact same your doing:
Obviously, it's advised to come into a draft with a plan on what you want to do. This plan should be simple and non-specific.
For example, part of my plan in my first draft this season was to draft two running backs and a receiver with my first three picks. It didn't matter how I got to that point, as long as I entered the fourth round with two backs and a wideout.
I kept it simple, followed my basic plan and finished with one of the best teams I've had in my 10 years of fantasy football.
By having a basic and simple plan, you leave yourself room to improvise and adapt to what happened before and after your pick. If you come in with an over-complicated plan that leaves little room to improvise, what happens when you start seeing your plan fall apart?
I strongly suggest you read the rest of "drafting" part of this article here: http://bleacherreport.com/articles/8161 ... le_oneline
It pretty much sums up your problem of over-thinking the draft. Don't go into the draft with a list of names you think are going to be there, instead come into the draft with a plan like the article suggests. If you want to go 2 RBs, a QB, and a WR in your first 4 picks, don't worry about taking them in a pre-planned round.